<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <style>
    .b {
      background-color: aquamarine;
      color: blue;
      text-align: center;
      font-family: "Microsoft JhengHei", serif;
      height: 100px;
      width: 100px;
      line-height: 100px;
    }
  </style>
</head>
<body>
<div class="b">
  <h1>SG</h1>
</div>
</body>
</html>